Gate-valve.



E. F. POLAND.

, GATE VALVE.

APPLIUATION FILED JUNE 1,2, 1913.

Patented Sept. 30, 1913.

am IMI,

COLUMBIA PMNMRAPH C0.,\{ASHINGTON. D. c.

' DWARD F. POLAND, 0F BOSTON, MASSACHUSETTS.

earn-VALVE.

` i. Application led .Tune 12, 1913. Serial No. 773,212.

Specoationof Letters Patent.

Patented Sept. 30, 1913.

To all whom t may4 concern.' Y Y i Be it known that I, EDWARD F. PoLAND,a citizen of the UnitedV States, residing at Boston, in the countyofSuffolkand State of .Massachusetta have invented an Improvement inGate-Valves, of whichV the following is a specification. p A

rlfhis invention relates to gate-valves espefcially designated forlow-pressures' and to control a large way, yet it'may be otherwiseemployed. The invention has forgits object to improve and simplify theconstruction ofthe valve to the end that it may be easily andcheaplyVmanufactured,` and is not liable to get Vout of order, and maybe easily and quickly operated. v 1

rlhe invention consists essentially in cer tain details ofconstructionof the means employed for moving the Vvalve-plate toward its seat andfor holding it inrm engage ment with its seat, which is operated-upon adownward movement of the valve-rod, assisted by the gravitatingaction ofthe valveplate and valve-rod, said means including a dog which isloosely suspended from the center of the back side of the valve-plateand which has an 'inclined portion and a shoulder for successivelyengaging a fixed part of the valve-case, thereby to move the dog bodilyinward and then rotatably, to in .on the dotted lline 2 2, Fig. 1, thevalveplate being in closed position. Fig. 3 is a similar transversevertical section,'the valveplate beingin open position.

10 representsa valve-case of any suitable .construction having acircular way or passage 12, through it arranged horizontally andprovided with a surrounding circular valve-seat 13, and also having anupwardlyextended chambered-portion 14, and a downwardly extendedchambered portion 15, the chambers of both portions` being in opencommunication with the passage 12 back of the valve-seat.A Thevalve-plate 20, is of circular form and is adapted toengagethevalve-seat 13, and it has anear21 on its back side, at the top,through which a pin 22, extends for pivotally or loosely connecting'thevalve-plate to the lower end of the valve-rod 23. The Valve-plate isthus loosely supported anddepends from the lower end of the valve-rodand is movable up and down by said rod uponup-and-down movementsthereof. The extent of upward movement of the valve-rod is sufficient toenable the plate to be entirely removed from Y the wav 12, and-to enterthe chamber 14.

rlhe valve-plate also has an ear 25 on its backl side, which iscentrally disposed, and to said ear a dog 30 is pivotally or otherwiseloosely connected, and said dog hangs by gravity unless otherwisesupported. Said dog is here shown 'as made of a length approximatelyequal to the radius of the valvepla-te, so that when supported upon thecentrally disposed ear 25 its lower end terminates substantially flushwith the lower edge of the valve-plate. The lower end of .theV dog has aprojection 31 which is substantially V-shaped and is arrangedintermediate its-width, and has a shoulder 35 in rear of 'saidprojection and has a projection 36 in front of said projection.

The valve-plate is raised by the valve-rod i into Ithe position shownin'Fig. 3, to open the way,said plate and dog entering the upper chamber14, and when in this position the valve-plate hangs loosely by gravityfrom the end of -the valve-rod,` and is deflected rear wall of thechambered portion 15,-

whereupon the dog is moved bodily in a direction toward the right tomove the valveplate toward its seat, and downward and inward movement ofthe valve-plate then continues until the shoulder 35 of the dog engagesa fixed part of the case, as for instance, the top of the rear wall ofthe chambered portion 15,. whereupon downward movement of the dog ceasesand a short rotary movement thereof begins by which theV 4acting as atoggle to force the valve-plate against its seat with a thrust dependingupon Ythe weight of the valve-plate and valve-rod, if gravity alone isutilized, or with such additional thrust as may be given to it. Thusengagement with a fixed part of the case by the projection and shoulderon the dog are successive. As the dog is moved rotatably on its pivot,its pivotal point is moved in a direction toward the right and thedistance between the shoulder 35 and the pivotal connection of thevalve-plate with the valve-rod is shortened, hence it will be observedthat when the valve-plate is in engagement with its seat it is held bythe dog and is substantially detained, as a thrust to move it away fromits seat must act to slide it in an upward direction on its seat andlift the rod a -short distance owing' to the positionof the dog and thetoggle effect which it'exerts when the plate is closed on its seat. Suchupward sliding movement is `opposed by the weight of the parts, yet iseasily accomplished by lifting the valve-rod. The valve-rod extendsabove the top of the chambered extension 14 of the case and has across-bar or other meansat its upper end for lifting it, and said rodValso has a stud 18extended from it laterally for engagement; -with theupper end of the case for the purpose ofholding the rod in elevatedposition. The valve-rod is made much smaller in diameter than the holeor passage through al valve-plate upon its seat and in holding it on itsseat. The lateral movement of the valve-rodis without especial functionexcept that it enables the stud 18 to enter the hole in the pipe-portionwithout lproviding a groove to receive it.

At the side of the case a water-gage 50, of any usual or suitableconstruction isor may be provided, which, as here shown, is con-A nectedby an open communicating passage tendedv from it ,at the top opening invan upward direction'tonear the top of the pipe- Vportion of the case, atwhich point it, is turnedvdownward to direct theow of water downward.

I .claim Y l. In a gate-valve, the combination with a valve case havinga Y horizontal passage through it with a surrounding valve-,seat andhaving chambers above and below the passage back of said'seat, ofavalve-plate contained in said case for engagementwith said seat having`an ear on its back side, at the top, a valverod arranged in the case andextended through the upper chamber thereof, which is pivot-allyconnected to said ear, an ear centrally disposedonthe back side of saidplate, a dog loosely connected to said central ear and depending`therefrom, said dog having a projection and a shoulder in rear of saidprojection for successive engagement withaiixed partzof -the oase',thereby to move the dog inward and then relatively to move thevalve-plate VVina direction to# ward its seat upon a downward-movementofl said plate, substantially asdescribed.

2. In a gate-valve, the combination with a i valve-cas-e having ahorizontal passage through it with a surrounding valveseat and having`chambers above and belowl the passage back of said seat, ofa valve-rodarthe lower end of the valve-rodand movablev up and down by said rod,adog loosely connected to the back side of said plate havingVV at itslower end a V-shaped projection and aV shoulder in rear of saidprojection for successive engagement with a fixed partv of the case,thereby to move said dog inward and then rotatably and-in turnmove thevalveplate ina direction toward its seat upon a ldownward movement ofsaid tiall-y as described.

3. In a gate-valve, a Vvalve-case having, af horizontal passage throughit witha Vsurrounding lvalve-seat and having chambers above and belowthev passagebaclr of ysaid seat,l a valve-rod arrangedin the'case andextended through the upper chamber thereof, a valve plate oon! tained inthe case for engagement with said.' u

seat which is loosely supported at the lower end of the valve-rod andismovable up and down by said rod, a dogpivotally connected to t-he backside ofsaid'pla-te, at thecenter.

thereof, having ,a projection with an inclined side and ashoulder `inrea-r ofsaid proj ectionr for successive engagement with a xedpartplate, Vsubstanof the' case, thereby to move the dog bodily Y inward andsubsequently turn it oiiits pivot lto move the valve-plate in adirection toward its seat upon adownward movement of the plate,substantially as described. .Y Y

t.V Ina gate-valve, the (combination with a valve-case haviiigahorizontalpassage through it and a surroundingvalve-seat and Y t havingchambers abov'eand'belowithe pas-K..

sage back of said seat,`a valve-rod arranged,

inthe case and V4extended through thelupper chamber thereof, avalvefplate containedin 'L the case for engagement with saidseat, said vplaie being `loosely supported at thelower; end of the valve-rodandjmovable up and"` down by said rod, a dog pivotally connected to theback side of said plate, at the center thereof, having a projection withan inclined side and a shoulder in rear of said projection forsuccessive engagement with a fixed part of the case, thereby to move thedog inward and rotatably and in turn move the valveplate in a directiontoward its seat upon a downward movement of the valve-plate, the pivotalconnection of the dog with the plate being arranged at the front side ofa straight line passing through the shoulder and the pivotal connectionof the plate with the rod, substantially as described.

5. In a gatevalve, the combination with a valve-case having afhorizontal passage through it and a surrounding valve-seat and havingchambers above and below the passage back of said seat, and havingvertical guide-ribs at the sides of the passage, of a valve-platecontained in the case for engagement with said seat, having an ear onits back side, at the top, a `valve-rod arranged in the case andextended through the upperV chamber thereof which is pivotally connectedwith said bar, an ear centrally disposed on the back side of said plate,a dog loosely connected to said ear and depending therefrom, said doghaving a projection and a shoulder in rear of the projection for succes-Copies of this patent may be obtained for 6. In a gatevalve, thecombination with a valve-case having a horizontal passage through itwith a surrounding valve seat, of a vvalve-plate arranged in said casefor engagement with said seat, a valve-rod loosely arranged in the caseand pivotally connected to said plate, a dog loosely connected to theplate having a projection and a shoulder in rear of said projection forsuccessive engagement with a fixed part of theJ case, thereby to movethe dog inward and then rotatably to'move the valve-plate in a directiontoward its seat and to close it upon its seat upon a downward movementof said plate and valve-rod due to gravity, substantially as described.Y

v In testimony whereof, I have signed my name to this specication, inthe presence of two subscribing witnesses.

VEDWARD F. POLAND.

Witnesses:

H. B. DAVIS, B. J. WAYNE.

ve cents each, by addressing the Commissioner of Patents,

Washington, D. C.

